change default player in context menu

Using Cirrus Extended v2 skin
When I bring up the context menu for a movie and select play using, there are 2 choices available (DVD player which is the default and Windows Media Center).
I would like to have the Windows Media Center as the default choice, where is the setting to do this? I have been unable to find it.
I don't want to change this to the default player for all movies, as I have playercorefactory.xml set up to use WMC for my DRM files. I just want to have it default to WMC when I select a DRM file without having to bring up the context menu and select WMC to play the file. Thanks.

Like I said in my post, I don't want to change the default player, I just use WMP to play a few files that will not play in XBMC by default. I have the playercorefactory set up to play them (which works fine), I just want the context menu to show WMP as the default rather than DVD player as it is now, so that I can just select the movie and it will automatically play without bringing up the context menu and select play using... and then select WMP. I hope I am explaining this clearly. I have not found any info on how to do this.
Thanks.